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Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines
Published on: June 23, 2019
N‑Alkyl and N‑Aryl Aminopyrazole Spirocarbamates: A Two-Pronged Lead Optimization Strategy to Identify Orally
Rohan R Merchant1, Natalia Chernyak1, Jovan A Lopez1
1Department of Discovery Chemistry, Merck & Co., Inc., South San Francisco, California 94080, United States.
Abstract:
Plasma kallikrein (pKal) is a trypsin-like serine protease involved in the kallikrein-kinin, renin-angiotensin, and complement pathways, making it an attractive target for diseases, such as hereditary angioedema, diabetic mellitus complications, and cerebrovascular disorders. As part of an internal program to develop orally bioavailable small-molecule pKal inhibitors, we report lead optimization efforts within the spirocarbamate scaffold, highlighting a structure-based drug design strategy to engineer hydrogen bond interactions with N-benzyl aminopyrazoles. Additionally, mitigation of time-dependent inhibition (TDI) liability and optimization of the overall profile were achieved through a two-pronged strategy: (1) incorporating increased Fsp3 modifications via N-alkylation and (2) leveraging torsional strain in N-aryl analogs.
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